Rotatable grinding or honing device



Nov. 17, 1931. JOHNSON 1,832,635

ROTATABLE GRINDING OR HONING DEVICE Filed Feb. 4, 1928 4 Sheets-Sheet lNov. 17, 1931. A. M. JOHNSON ROTATABLE GRINDING OR HONING DEVICE FiledFeb.-4, 1928 4 Sheets-Sheet 2 Nov. 17 1931. A. M. JOHNSON ROTATABLEGRINDING 0R HONING DEVICE 4 Sheets-Sheet 3 Filed Feb. 4, l928 WZZZ/6115K 1 272 a k/ZIZSOIZ Patented Nov. 17, 1931 UNITED STATES ARTHURM. J OHN SON, OF HIGHLAND PARK, ILLINOIS ROTATABLE GRINDING 0R HONINGDEVICE Application filed February 4, 1928. Serial No. 251,830.

This invention relates to rotatable grinding or honing devices andparticularly to devices of the character adapted for use in honing orsurfacing the inner face or walls of engine cylinders or the like.

One object of the present invention is to provide means for varying thediametrical dimension of the grinding tool by a novel construction andarrangement whereby a plurality of annularly spaced grinding stones aremoved radially and uniformly with respect to the center of rotation ofthe tool.

Another object of the invention is to provide means whereby, in theoperation of the device, the stones are uniformly supported throughouttheir entire length regardless of the degree of contraction or expansionto which the tool may be adjusted.

Another object of the invention is to provide a hone body of novelconstruction on which the stones and stone actuating means may beconveniently mounted in a manner to be readily assembled anddisassembled, and on which a portion of the stone actuating means isformed, and having also a novel construction whereby the stones aresecured against longitudinal movement with respect to the hone body.

Another object of the invention is to pro vide suitable driving meansfor rotating the honing tool, the said means embodying a novelconstruction and arrangement for actuating and controlling the toolexpanding or stone adjusting means.

Anouier obj ct of the invention is to provide a novel coupling means forreadily connecting and disconnecting the tool to and from its drivingspindle.

Another object of the invention is to provide a novel construction andarrangement, whereby the actuation of the tool expansion controllingmeans may be definitely determined.

A further object of the invention is to provide a device of thecharacter described wherein a suitable degree of flexibility between thetool. and its driving means may be obtained to facilitate the centeringof the tool within an eng ne cylinder or the like.

A still further object of the invention is to provide an efiicient,practicable and durable cylinder hone, and to improve devices of thischaracter in sundry details hereina ter described and particularlypointed out in the appended claims.

One embodiment of the invention is shown for illustrative purposes inthe accompanyin g drawings, in which Fig. 1 is a side elevational viewof a cylinder grinding device embodying my invention.

Fig. 2 is an enlarged side elevational view of the honing tool shown inFig. 1.

Fig. 3 is a longitudinal sectional elevation of the honing tool taken asindicated by the line 3-3 of Fig, 2.

Fig. 4 is a. transverse sectional view taken on the line 4-4 of Fig. 3.

Fig. 5 is a transverse sectional View taken on the line 55 of Fig. 3 andillustrating the manner of actuating the coupling means for connectingthe grinding tool and spindle.

Fig. 6 is a bottom plan or lower end view of the grinding toolillustrated in Figs. 2 and 3.

Fig, 7 is a transverse sectional plan view taken on the line 7-7 of Fig.3, illustrating the construction of the coupling means.

Fig. 8 is a fragmentary elevational View of the parts shown in Fig. 7.

Fig- 9 is a perspective view of one of the grinding stone adjustingbars.

Fig. 10 is a central sectional elevation of the driving means and theconstruction and arrangement of means for actuating and controlling thetool expanding or stone adjusting means.

Fig, 11 is a side elevational view of a portion of Fig. lll'having partsthereof broken away to illustrate, more clearly, the construction ofportions of the tool expanding or adjusting means.

Fig. 12 is a transverse sectional plan view taken on the line 12-12 ofFig. 10.

Fig. 13 is a transverse sectional plan view talren on the line 13-13 ofFig. 10.

Fig. 14.- is a transverse sectional plan view taken on the line 14-44 ofFig. 10.

Fig. 15 is a fragmentary sectional elevation taken on the line 1515 ofFig. 14.

Referring to the drawings, and particularly to Figs. 1 to 9 inclusivethereof, the present invention includes a rotatable longitudinallyreciprocable grinding tool or cylinder hone designated as a whole by thenumeral 20, and comprising a base or body member or portion 21 having aplurality of longitudinally disposed radially movable abrading stones 22mounted therein and annularly spaced around the periphery of said bodymembers.

For mounting the abrading stones 22 in the bony member 21 in a manner topermit of radial movement withirespect thereto, the stones are suitablysecured, preferably rigidly in stone holders 23 adapted to be positionedin longitudinal grooves 24!: formed in the periphery of the centralportion 21a of the body member 21 and extending longitudinally withrespect thereto, the said holders being secured against longitudinalmovement with respect to the body member by means of shoulders 25,shown, in the present instance, as provided by rat ially slotted annularflanges 26 formed integrally with and adjacent the ends of the bodymember 21.

For moving the abrading stones 22 and stone holders 23 outwardly withrespect to the body member 21, when it is desired to expand thediametrical dimension of the tool. 20 for the purpose of maintaining theabrading stones 22 in contact with the surface to be operated upon, as,for example, the inner surface of an engine cylinder or the like. thebody member 21 is provided, preferably adjacent its opposite ends, withcams 27 inclined at an angle to the center line of the body member 21,the inclined planes of the cams extending in parallel relation to eachother. The cams 27 of the illustrative embodiment of the invention areshown in the drawings as formed integrally with the body member 21 withtheir inclined surfaces extending annularly around the body member andforming, in effect, a truncated cone construction adjacent opposite endsof the body member. It will be observed that by such construction, thecams 27 may be accurately formed by turning down the body member 21,thereby providing annular grooves between the central portion 21a of thebody member and the annular flanges 26 adjacent the ends of the bodymember.

Formed in the central. portion. 21a of the bodv member 21 and extendinglongitudinah ly thereof are a plurality of annularly spaced QIOOVQS orchannels 28 positioned in. the radial plane of the holders 23 andchannels 21. the channel 28 being preferablv relatively narrower thanthe channel 24;. Positioned in the channels 28 in. a manner to be movedlongitndina ly and laterally therein are a plurality of abrading stoneadjusting'bars 29 comprising a relatively thin central portion adaptedto be positioned in the groove or channel 28 between the body member 21and stone holders 23 and having inclined cam surfaces or portions 30formed adjacent their opposite ends and adapted to engage and c0-operate with the resp ctive cams 21' formed adjacent the ends oi thebody member it will be observed by reference particularly to F 3, thatwhen the abrading stones 22 are in their retracted position and thediametrical dimension of the tool 20 reduced to a minimum, theconstruction and arrangement of the adj usting bars 29 and cam portions30 are such that the stone holders 23 are compl rely supportedthroughout their entire length by said adjusting bars and theirintegrally formed cam portions 30, thereby prerenting a1 tilting orcantinu oi": the abrading stones 22 and holders 2a in their supportinggrooves or channels by reason of any portion oi the stone holders 23extending lieyend their supports, shown, in the p resent instance as theadjusting bars 29.

For moving the adjusting bars 29 longitudinally in their respectivegrooves 28, the bars are provided, adjacent one of their end portions.with transversely extendin notches 81 'lapted to receive th outer endportions radially extending arms or lingers cmnprising part oi a spidermember 35 having a centrally disposed hollow shank portion 3 1 slidablymounted in a centrally disposed longitudinally extending bore 3::

formed in the body member 21, the said arms or lingers 32 extendingthrough radially disposed slots formed in the body member in a manner topermit the spider L0 be moved longitudinally thereof and secured againstrotary movement with respect thereto.

Extending longi aulinally through the hollow shank portion and throughthe bore 3:7 and the relatively smaller bore termed in the body member21 a longitudinally moi able spider shifting rod ha ing secure" to itsouter or lower end, b yond the spider member 33, a spherically termedwasher -39 by means of nuts 410 in a ma er to ,ause the spider memberand ra lly e endin arms or lingers 32 to be moved lon. udinally of thebody member 21 when the rel 38 is moved in an upwardly direction withrespect to the body nieinl er 21, thereby cruising: the adjusting bars29, through their conn r tion with the arms 32, to be moved in the samedirect-ion and causing the cam fac 30 of the adjusting bars 29 toimpinge the inclined surfaces of the cams in a manner to cause the bars29 to move laterally or radially with respect to the body member 21,thereby moving the stone holders and scones 22 outwardly and radiallywith respect to bod -r member 21, thus iucreas' 1g the diainetricaldimension of tie tool 20 for re outer surface of the abrading stones 22in eugagement with the surface or surfaces to be operated upon. Formoving the spider 33 and connected adjusting bars 29 in the oppositedirection, a compression spring 4 1 is positioned in the bore 35 in amanner to operate between the inner end of the shank portion 34 of thespider 33 and a shoulder 42 formed in the body member 21 at one end ofthe bore 35, and it will be obser ed that as the spider member andadjusting bars 29 are moved outwardly by the spring 41, the cam surfaces30 of the bars 29 will follow the inclined surfaces of the cams 27inwardly toward the center of the body member 21, thereby permitting thabrading stones 22 and stone holders 23 to be drawn inwardly toward thebody member 21 by means of resilient flexible bands 43, shown in thepresent instance, as helical tension springs encompassing the pins ortrunnions 4-4, the latter being preferably screw threaded into theopposite ends of the stone holders 23 and extendingoutwardly therefromthrough radially disposed notches or slots 4.5 formed in the annularflanges 26 of the body member 21 adjacent the ends thereof, and the saidnotches the lower or outor end of the body member forming a continuationof the slots 36, in which are positioned the arms or fingers 32 of thespider member 33. i

For operating the grinding tool or hone 20, a rotatable longitudinallyreciprocable hollow spindle 46 is secured at its lower end, by means ofa releasible coupling to the body member 21 and at its upper end isprovided with a coupling 47 having a tapered shank portion 48 adapted tobe secured in a supporting member 49 connected with any suitablemechanism, not shown, for imparting a rotary and reciprocatory movementto the spindle, or, if desired, instead of reciprocating the spindle 46and tool 20, the work to be operated upon may be reciprocated withrespect to the tool, in which case, the mechanism to which the member 49is connected may be constructed to impart only a rotary moven'ient tothe spindle and tool.

For securing the spindle 46 to the tool 20 in a manner to be readilyconnected thereto and disconnected therefrom, the body member 21 isprovided adjacentits upper end with a relatively reduced portion 50having a centrally disposed longitudinally extending bore 01 socket 51formed therein adapted to receive the lower end of the spindle 46. Theportion 50 is provided with apair of dismetrically and radially disposedvertically extending notches and slots 52 adapted to receive therein apair of oppositely di, iosed radially extending pins or trunnions o3cured to the opposite sides of the spindle 48' in a manner to cause thebody portion to rotats with the spindle. Surrounding the portion 50 is alocking sleeve 54 secured against longitudinal movement on the portion50 by means of a pair of pins 55, shown in the present instance asmachine screws, secured to diametrically opposite sides of the portion50 and extending radially therefrom at an angle of substantially ninetydegrees to the radial line of the notches or slots 52. The pins or screwheads 55 extend into horizon tally disposed elongated openings or slots56 formed in the sleeve 54 which permit of a limited rotary movement ofthe sleeve on the portion 50.

Formed in the sleeve 54 adjacent the lower end thereof is an annularrecess or counterbore 57, see Figs. 3 and 5, adapted to receive aresilient tension member shown in the present instance as a coil spring58 having one of its ends secured to the portion 50 of the body member21, as indicated at 59 in Fig. 5, and its opposite end, under tension,to the sleeve as indicated at 3-0. Thus, it will be seen that the spring58 under tension holds the sleeve yieldingly against the pins or screwheads 55 at one end of the slots 56.

Formed in the sleeve 54 at substantially ri ht angles to the slots is apair of opposit-ely disposed L-shaped slots 61, the vertical portions 62of which may be brought into register with the slots or notches 52 byrotating the sleeve 54 against the action of the spring 58 to a pointwhere the pins or screw heads 55 occupy a position in the opposite endsof the horizontal slots 56, and while the slots 52 in the portion 50 andthe vertical portions 62 of the L-shaped slots 61 are in regis tor, theradially extending pins 53 secured to the spindle 46 may be positionedin the bottoms of the slots 52 and horizontal portions of the slots 61,after which the sleeve 54 may be released. and the sleeve rotated undertension of the spring 58 to bring the closed ends of the slots 61against the pins 53 and the overhanging portions 544 of the sleeve 54across the slots 52, thereby closing the upper ends of the slots 52 aainst the removal of the pins 53 and preventing the longitudinaldisplacement of the spindle 46 with respect to the body portion 21.

For adjusting the bars 29 and integral cam faces 30 thereoflongitudinally of the cams 27 in a manner to move the stones 22 andstone holders n3 outwardly or radially with respect to the body member21, a novel adjusting means, designated as a whole by numeral 63, isprovided, see particularly Figs. 1 and 10 to 15 inclusive.

This adjusting means 63 is held in spaced relation with respect to thegrinding tool 20 by means of a spacer shown in the present instance. astube 64 surrounding the rod and positioned within the hollow portion ofthe spindle 46, the lower end of the tube being seated in a cup-likedepression 65, 3, formed in the body member 21 adjacent the bottom ofthe socket 51, while the upper end of the tube is adapted to seat in aninverted cup-like depression 66 formed in the underside of a thrustplate (37 having an opening therein adjacent its central portion throughwhich the rod 38 extends, and thence upwardly through an opening formedin a second thrust plate 68 having a cup-like dcpres sion 69 formed inits upper side adapted to receive a. spherical portion T0 of a head 71formed on the upper end of the rod 38. The spindle i6 is )lOTlClUladjacent its upper end portion with a pair of: diametrically disposedlongitudinally extending slots 72 through which the en 1 of the thrustplates (57 and 68 extend, the said plates being adapted to engage at thir outer ends r 4 of the rings of antidric-tion thrust bear 1 T8 ano Tl,surrounding the spindle d6, while the other or opposing rings of therespective thrust bearings 73 and M are seated in the bottom portions ofop 'iositely disposed relatively adj ustable non-rotatable socketmembers 75 and 76, respectively, the said socket members having formedin the bottom portions thereof the openings 77 and 78, respectively, forthe passage of the spindle 4G therethrough.

It will he observed from the foregoing description that the spindle 26may be rotated arrying with it the thrust plates 67 and 68 'oe'cther wita one of the rings of the bearings md Tl, ntiile the other rings of thebear and socket members 75 and 76 remain .onary or non-rotatable.

For securing the socket members 75 and T6 against rotation, a holdingmember 79 is provided with a laterally extending arm 80 having a roller81. secured to its outer or free end, the said roller being adapted tobe engeged between the legs of a vertically extending channel. member 82secured preferably to the frame or some fixed part of the machinecontainin r the me hanism for reciprocating and rot ng the spindle 46and tool 20, hus permitting the spindle, tool and adjusting means 6?,-to be rec'grocated and at the same time securing the holding member 79against rotation. 7

Formed on the upper side of the member 79 a boss 83 over which thesocket member 75 is adapted to lit to prevent lateral or transversemovement of the said socket meml ct to the nolding member 79, the loweredge of the socket a notch or key-way 84:, Fig. 15,

i 5 adapted to receive a lug or key 85 of corresponding dimensionsformed on the periphery oi": the boss 83, hereby securing the socketmember in against annular movement with resoect to the holding member79.

For securing the socket member 75 snugly a and a z inst the upper face o3 g member '79. a plurality of pins iavin shank portions 87 areanthrough openings formed in the upper end or bottom portion of theinverted socket member '1' 5 and through apertures formed in the holdingmember 79, the lower end of the shank portion 87 being provided withthreads adapted to receive nuts 88. The upper ends of the pins or bolts86 are formed with relatively large upwardly extending head portions 89,providing shoulders adapted to engage the top surface of: the socketmember 75 in a manner to enable the nuts 88 to draw the socket member T5snugly against the hold ing member 79. The head portions 89 are adaptedto be slidably received in registering apertures termed in the bottomportion of the socket member 76 in a manner to secure the member '76against rotation and at the same time pern'iit of relative longitudinalor vertical. adjustment of the member 76 with respect to the socketmember 75.

F or moving the socket member 76 and rod 38 longitudinally wth respectto the socket member '25, it will be noted. by reference to Fig. 10 thatthe respective socket members 75 and 7" are provided on their outerannular faces with screw threads of relatively diii'erent pitch, forexam ple, the socket member may have ten threads to the inch, and thesocket member may e provided with sixteen thrones to the inch.Surrounding the socket members is an adjusting sleeve 91 having screwthreads of relatively different pitch formed therein adapted forengagement with the threads of corresponding pitch formed on therespective socket mer hers T5 and 76, for

example, the threads formed in the lower end portion of the sleeve 91are adapted to engage the screw threads on the SOCIGE member 75, and thethreads formed in "the upper end portion of the sleeve 91 are adapted toengage the screw threads formed on the socket member 76.

For convenience and certainty of rotation, the adjusting sleeve 91 maybe knurled as indicated, and it will be noted that if the sleeve isrotated to the right as viewed in Figs. 10 and 11 or counter-clockwise,as viewed in Figs. 12 and 13, assuming that the threads on the sleeveare of right hand formation, the sleeve 91 will move longitudinally andupwardly with respect to the socket member 75, and although the sleevescrew threaded engagement with the socket member 76, by reason of thedilterence in the pitch of the threads formed on the respective sockets,the socket member 76 will be moved longitudinally and upwardly withrespect to the socket member 75, although at a reduced speed as comparedwith that of the sleeve 91. This movement of the sleeve 76, it will benoted, is transmitted to the adjuttin g rod 38 through the thrustbearing 74- and adjusting rod thrust plate 68, thereby causing an upwardlongitudinal movement of the rod 38, spider member 33 and adjusting bars29, the latter,

by reason of their integral cam faces 30 engaging the cams 27 formed onthe body member 21, being also moved outwardly in a manner to force thestones 22 and stone holders 23 radially with respect to the body member21 against the action of the resilient flexible 'on springs 43 for thepurpose of maintaining the grinding stones 22 in contact with thesurfaces to be operated upon.

For limiting the movement of the adjusting sleeve 91 in a manner todetermine the amount of material to be removed by the stones 22, a screwthreaded ring mounted on the socket member 75 in threaded eng menttherewith, and has provided on its up per side a lug or stop 93 adaptedto be engaged by a depending lug or finger 94- formed on the lower endof the adjusting sleeve 91 when the sleeve has reached the desired limitof adjustment. F or locking the ring $2 in adjusted position, a jam nutor ring 95 is mounted on the socket member 75 in screw threa ledengagement therewith and may be forced 1 ainst the under or lower sideof the ring 92 after the lug 93 thereon bee; positioned, desired, withrespect tothe lug or finger 9% formed on the adjusting sleeve 91. c

In the operation of the device, the grinding tool. may be positioned,for example, within the bore of an engine cylinder to be ground, and thegrinding stones 22 moved radially of the body member Qlby the rotatier 5the adjusting sleeve 91 until they contact with the walls of thecylinder, after which the ring 92 may be rotated in a manto move the lug93 away from the lug 4:

" t distance to permit of the desired dal adjustment of the forrr-anoving prenetermined amount of material from the inner surface ofthe cylinder wall. and the ring 92 and lug 93 may then he seemed in suchposition by means of the jam ring 95. The mechanism for rotating andreciprocating the spindle 4-8 and tool 20 may then be started and as thesurface of the ox linder wall is ground away, the stones 22 may be movedoutwardly to retain grinding i o the adiusting sleeve 91 as heretofore,ed until the lug 9dof the adjusting sleeve en the lug 93 of the sleeveor ring 92. at which time the desired amount of ma terial will have beenremoved from the wall of the cylinder. 7

i ill be noted by reference to the drawparticularly 3 and 10, that byreaof the clearance provided between various port ons of the device,themanne'r of l A he rod 38 to the spid r 33 and jif 'ti rod thrustplate 68, and the v ioning the spacing tube 64 'erence to the bodymember 21 and 5- vWing tube thr t plate ()7, a degree of tiers ibilityin the devi e is obtainedwhich enables cont ct with the surface operatedupon by the proper centering and operation of the grinding tool 20within the cylinder bore.

Obviously, the present invention is not limited to'the preciseconstruction and arrangement shown and described, as the same may bevariously modified. Moreover, all the features of the invention need notbe used conjointly as the same may be used. to advantage in variouslydifferent combinations and sub-combinations.

What l claim as my invention and desire to secure by Letters Patent is:

1. A device of the class described comprising, in combination, a bodymember provided with a plurality of eircumferentiallyspaced longitudinalradially formed grooves, cams mounted at the respective bottoms of eachof said grooves, a plurality of radially movable abrading stones mountedin the grooves on said body member and'carried by said cams but beingformed separately therefrom, means movable longitudinally with respectto said body member for operating said cams for moving said stonesradially with respect to said body member, means for holding theabrading stones in contact with the supporting surfaces of said cammembers, and means for adjusting said longitudinally movable means withrespect to said cams.

2. A device of the class described comprising, in combination, a bodymember provid ed with a plurality of circumferentially spacedlongitudinal radially formed grooves, cams formed at the respectivebottoms of each of said grooves, a plurality of annularly spacedradially movable abrading stones mounted in the grooves on said bodymember and carried by said cams but being formed separately therefrom,longitudinally movablc means positioned between said cams and stones andco-operable with said cams for moving said stones radially with respectto said body member, means for holding the abrading stones in contactwith the sup aorting surfaces of said cam members, an adjustable meansfor positioning said longitudinally movable means with respect to saidcams. a

3. A device of the class described comprising, in combination, a bodymember provided with a plurality of circumferentially spacedlongitudinal radially formed grooves, cams formed at'the respectivebottoms of each of said grooves, a plurality of annular- ,lyspacedjradially movable abrading stones mounted in the grooves on saidbody member, a plurality of longitudinally movable stone adjusting barsin said rooves co-operable with said cams for moving said stonesoutwardly with respect to said body member, means for moving said stonesinwardly with respect to said body member and for holdingthem in contactwith said stone adjusting bars, a driving spindle connected to said bodymember, and rotatable longitudinally adjustable means for moving saidbars longitudinally of said cams.

l. A device of the class described comprisin g, in combination, a bodymember provided with a plurality of circumferentialiy spacedlongitudinal radially formed grooves, cams formed at the respectivebottoms of each of said grooves adjacent the ends thereof, a pluralityof annularly spaced radially movable abrading stones mounted in thegrooves on said body member, a plurality of longitudinally andtransversely movable stone adjusting bars carrying wedge-shaped portionspositioned between said cams and stones and co-operable therewith formoving said stones outwardly with respect to said body member, resilientmeans for moving said stones inwardly with respect to said body member,a driving spindle releasably connected to said body member, androtatable longitudinally adjustable means associated with said spindlefor moving said bars longitudinally of said cams in a manner to movesaid bars laterally nd said stones outwardly with respect to said bodymember.

5. A device of the class described comprising, in combination, a bodymember provided with a plurality of circumferentially spacedlongitudinal radially formed grooves, cams formed at the bottoms of saidgrooves adjacent the ends thereof, a plurality of radially movableabrading stones mounted in said body member, a plurality oflongitudinally movable adjusting bars positioned between said cans andstones and having inclined cam faces adjacent their end portions adaptedto engage said cams, means for moving said stones inwardly with respectto said body member, a driving spindle, a releasable coupling forconnecting said body member to said spindle in a manner to be rotatedtherewith, and rotatable longitudinally adjustable means associated withsaid spindle for moving said cam faces along said came in a manner tomove said bars laterally and said stones outwardly with respect to saidbod member.

6. A device of the class described comprising, in combination, a bodymember, cams formed thereon adjacent the ends thereof, a plurality ofradially movable abrading stones having holders therefor mounted in saidbody member, a plurality of longitudinally movable adjusting barspositioned be tween said cams and holders and having inclined cam facesformed thereon adjacent their end portions adapted to engage said cams,resilient means for moving said holders inwardly with respect to saidbody member, a rotatable driving spindle, a releasable coupling forconnecting said body member to said spindle in a manner to be rotatedtherewith, and rotatable longitudinally adjustable means associated withsaid spindle for moving said cam faces longitudinally along said isomer;

cams in a manner to move said bars laterally and said holders and stonesoutwardly with respect to said body member.

7. A device of the class described comprising, in combination, a bodymember, cams formed thereon adjacent the ends thereof, a plurality ofradially movable ab ading stones mounted in said body member, aplurality of longitudinally movable adjusting bars positioned betweensaid cams and said stones and having inclined cam surfaces formedthereon adjacent their end portions adapted to engage said cams, meanson said body member for holding said stones against longitudinalmovement with respect thereto, resilient means for moving said stonesinwardly with respect to said body member, a rotatable longitudinallyreciprocable driving spindle, a releasable coupling for connecting saidbody member to said spindle in a manner to be rotated and reciprocatedtherewith, and rotatable longitudinally adjustable means associated withsaid spindle for moving said cam surfaces longitudinally along said camsin a manner to move said bars laterally and said stones outwardly withrespect to said body member.

8. A device of the class described comprising, in combination, a bodymember, cams formed thereon adjacent the ends thereof, a plurality ofradially movable abra ding stones having holders therefor mounted insaid body member, a plurality of longitudinally movable adjusting barspositioned between said cams and holders and having inclined camportions formed thereon adjacent the ends thereof adapted to engage saidcams, means formed on said body member adjacent the ends thereof forsecuring said stones and holders against longitudinal movement withrespect to said body member, resilientmeans for moving said stones andholders inwardly with respect to said body member, a verticallyreciprocable and rotatable driving spindle, a releasable coupling forconnecting said body member to said spindle in a manner to be rotatedand reciprocated therewith, and rotatable longitudinally adjustablemeans associated with said spindle for moving said adjusting bars andcam portions longitudinally along said cams in a manner to move saidbars laterally and said holders and stones outwardly with respect tosaid body memher.

9. A device of the class described compris- I I ing, in combination,body member provided with a plurality of circumferentially spacedlongitudinal radially formed grooves, cams formed at the respectivebottoms of each of said grooves adjacent the ends thereof, a pluhavinginclined cam faces formed thereon adjacent the ends thereof adapted toengage and co-operate with said cams, means formed on said memberadjacent the ends thereof and co-operable with means on the respectiveends the ends of said holders for securing said stones and holdersagainst longitudinal movement with respect to said body member,

resilient means for moving said stones and holders inwardly With respectto said body member, a vertically reciprocable and rotatable hollowdriving spindle, longitudinally extending means positioned within thehollow portion of said spindle means for connecting said body member tosaid spindle in a manner to'be rotated and 'reciprocated therewith, androtatable longitudinally adj ustable means surrounding said spindle andconnected with said means positioned within the hollow port-ion of saidspindle for moving said adjusting bars and cam faces longitudb formedthereon cooperable with said cams in a manner to provide supports forsaid stones throughout their entire length, a spider member mounted insaid body member and having a plurality of radially extending armsengageable with said bars, a rotatable vertical reciprocable hollowdriving spindle,

a releasable coupling for connecting said body member to said spindle ina manner to be rotated and reciprocated therewith, a rod positioned inthe hollow portion of said spindle and the opening formed in said bodymember, said rod being connected to said spider member, and rotatablelongitudinally movable means operatively connected to said rod foradjusting bars longitudinally oi said cams.

11. A device of the class described comprising, in combination, a bodymember having a longitudinally extending opening therein and cams formedthereon adjacent the ends thereof, a plurality of annularly spacedradially movable abrading stones having holders therefor mounted in saidbody member, a plurality of longitudinally adjustable stone adjustingbars positioned between said body member and holders and having camsurfaces formed thereon adjacent their end portions and co-operable withsaid cams in a manner to provide supports for said stones and holdersthroughout their entire length regardless of the adjustment of 7 havingcams formed said bars with respect to said cams, a spider memberslidably mounted in said body member and having a plurality of annularlyspaced radiallyestending arms en 'ageable with said bars, a rotatablevertically reciprocable hollow spindle, means mounted adjacent the upperend of said body member for connecting the body member to said spindlein a manner tobe' rotated and reciprocated therewith, a rod positionedin the hollow portion of said spindle and the opening formed in saidbody member, said rod being connected at its lower end to said spidermember, rotatable longitudinally movable moans surrounding said spindleand operatively connected therewith and with said rod for adjusting saidbars longitudinally of said cams in one direction, and means for movingsaid spider and bars in the opposite direction.

12. A device of the class described comprising, in combination, a bodymember provided with a plurality of circumferenliall'y spacedlongitudinal radially formed grooves the bottoms thereof, a plurality ofradially movable abrading stones and holders therefor mounted in saidmember, adjusting bars co-operable with said cams for moving saidstonesoutwardly with respect to said members, and means for adjustingsaid bars with respect to cams, said means including a rod operativelyconnected to said bars, a plurality of relatively movable adjustingmembers operatively related to said body member and said rod respectively, and means operatively connected to said adjusting membersfor moving said members with respect to each other in a manner to movesaid rod and bars with respect to said body member and cams in saidgrooves.

13. A device of the class described comprising, in combination, a bodymember having cams formed thereon, a plurality of radially movableabrading stones and ho ,rs therefor mounted in said member, ad ustingbars engageable with said cams and ho ders for moving said stonesoutwardly with respect to said member, and means for adjusting'said barswith respect to said cams, said means including a rod operativelyconnected to said bars, a plurality oi: longitudinally movablerelatively adjustable socket members operatively related to said bodymember and said rod, respectively, and a sleeve having screw threadedengagement with said socket members for adjusting said members withrespect to eachother to move said rods and bars withrespect to said camsin a manner to cause sa d holders and stones to be moved outwardly withrespect to said body member.

14;. A device of the class described comprising, in combination, a bodymember having cams formed thereon, a plurality of radially movableabrading stones and holders there- ,rmeans inely connected to saidlongitudinally movable socllet members operabody member and said velr,the respective socket memscrew threads oi relatively diil'erirmedthereon, and a rotatable adustnig, sleeve sin-rot ling said socketmemand having screw threads of relatively ClllEF-lvili pitch formed"hrein engageable with the threads of corresponding pitch termed on therespective socket members for relatively adjusting said socket membersto e said rod and bar with resuect to said cams in a ier to cause saidholders and stones to he moved outwardly with respect to said bodymember.

15. A device of the class ribed comember havtiGSC oris 11in combination,a body 1 ill}: ea 15 termed ther on, a plurality of radially movableabrading' stones and holders nennte in said member, ad usting geablewith said cams and holders,

- or d ing said bars with respect to 3 in a manner to move said stones ywith respect to said member, said means inclnd', an adjusting rodoperativeconnected 0 said bars, plurality of re atively adjustablesocket members, thrust bearings positioned in the respective socketmembers, leans 3 for posi'ioning one oi said bearings with ect to saidbody member,

means for conn :5 the other oi said bearlively conne ted to said socketmembers for relatively adjusting; ienibors, rod and 1 s in a manner tocause one to t ed outwardly with respect to it body 'iemoer.

1 device o the class described com- J L g, in combinati n, a body memberhav- "sins formed tl ereon, a plurality of raiovable abrad' stones andholders is with said cams and holders,

'ror jrsting;- said bars with respect to .id earns 11 a manner to movesaid stones outwardly with respect to said member, said Excluding anadjusting rod operatively ed to said bars, a plurality of relaad ustablescrew threaded socket memnust bearings 9x -oned in the remembers, meansfor spacing said bearings and socl t members e ect to said body member,means for h the other of said earings to said rotatable screw threadedsleeve surroundin and having threaded engagement I i with suit socketmembers for relatively adjusting said members, rod and bars with respectto said. cams in a manner to cause said stones to be moved outwardlywith respect to said body member, and adjustable means for limiting therotation of said sleeve.

17. A device of the class described comprising, in combination, a bodymember having cams formed thereon, a plurality of radially movableabrading stones and holders therefor mounted in said member, adjustingbars cngageable with said cams and holders, means for adjusting saidbars with respect to said cams in manner to move said stones outwardlywith respect to said member, said means including an adjusting rodoperatively connected to said bars, a plurality of relatively adjustablenon-rotatable oppositely disposed screw threaded socket members, meansfor securing said members against rotation, anti-friction thrustbearings positioned in the respective socket members, means for spacingone 01": said bearings and socket momier-i with respect to said bodymember, means for connecting the other of said bearings to said rod, arotatable screw threaded sleeve surrounding and having threadedengagement with said socket members for relatively adjusting said socketmembers, rod and bars with respect to said cams in a manner to causesaid stones to be moved outwardly with respect to body member, ustablemeans for limiting; the rotation of said sleeve, and means forseemingsaid adjustable means in adjusted position.

18. A device of the class described comprising, in combination, a bodymember havin cams formed thereon, a plurality of radially movableabrading stones and holders therefor mounted in said member, adjustingbars eno'agcable with said cams and holders, a rotatable hollow spindleconnected to said body member and having diametrically disposedlongitudinally extending slots formed therein, means for adjusting saidbars with respect to said cams in a manner to move said stones outwardlywith respect to said member, said means including an adjusting; rodpositioned in the hollow portion of said spindle and operativelyconnected to said bars, a plurality of relatively adjustablenonrotatable socket members surrounding said spindle, means for securingsaid members against rotation, thrust bearings positioned in therespective socket members and surr unding said spindle, a thrust plateextending; through the slots formed in said spindle and o ierativelyrelated to one of said thrust bearings, means within the hollow portionof said spindle for positioning said plate with res'iect to said bodymember, a second thrust plate extending through said slots andoperatively related to the other of said bearings and to said adjustingrod, a rotatable sleeve aving screw threaded engagement with said sock tmembers for adjusting one of said members, said rod and bars withrespect to the other of said socket members and said cams, means mountedon one of said socket members and adjustably thereon for limiting therotation of said sleeve, and means for securing said adjustable means inadj usted position.

19. A device of the class described including adjusting means comprisinga plurality of relatively movable non-rotatable socket members havingscrew threads of relatively different pitch formed on the respectivemembers, means for securing said members against rotation, a thrustbearing positioned in one of said members, an adjusting rod operativelyrelated to said bearing, and a rotatable adjusting sleeve surroundingsaid members and having screw threads of relatively difierent pitchformed therein adapted vfor engagement with the threads of correspondingpitch formed on the respective socket members for adjusting one of saidmembers, said thrust bearing and rod with respect to the other of saidsocket members,

. 20. A device of the class described including adjusting meanscomprising, a plurality of relatively movable non-rotatable socketmembers having screw threads of relatively different pitch formed on therespective members, means for securing said members against rotation, athrust bearing positioned in one of said members, an adjusting rodoperatively related to said bearing, a rotatable adjusting sleevesurrounding said members and having screw threads of relativelydifferent pitch formed therein adapted for engagement with the threadsof corresponding pitch formed on the respective socket members foradjusting one of said members, said thrust bearing and rod with respectto the other of said socket members, adjustable means for limiting therotation of said sleeve, and means for securing said adjustable means inadjusted position.

21. A device of the class described including adjusting means comprisinga plurality of relatively movable, non-rotatable socket members, meansfor securing said members against rotation, a thrust bearing positionedin one of said members, an adjusting rod operatively related to saidbearing, a rotatable adjusting sleeve having screw threaded engagementwith the other of said members and being operatively related to said oneof said members for adjusting said last mentioned member, said thrustbearing and adjusting rod with respect to said other of said members.

In testimony whereof I have signed my name to this specification, onthis 30th day of January A. D. 1928.

ARTHUR M. JOHNSON.

